THE TOPLINE: The Las Vegas shooting that killed at least 59 people and injured over 500 has no ties to an international terrorist group, the FBI said Monday.

"We have determined, to this point, no connection with an international terrorist group," an FBI special agent said Monday. "As this investigation continues, we will continue to work with our partners to ensure that this is factually, thoroughly and absolutely investigated, to be able to bring comfort and peace back to this community."

Earlier in the day, the Islamic State in Iraq and Syria (ISIS) claimed the shooter was one of its "soldiers," but provided no evidence to back up its claim.

Authorities have identified the gunman as Stephen Paddock, a 64-year-old Nevada resident, who was found dead in a hotel room.

TERROR EXPERTS PUZZLED BY ISIS CLAIM: Less than 12 hours after a man identified by police as Stephen Paddock opened fire on an outdoor country music concert, killing at least 59 and perpetrating the deadliest mass shooting in modern U.S. history, the Islamic State in Iraq and Syria (ISIS) issued a statement that puzzled terror experts.

The group took credit for the attack on its semi-official news agency, Amaq.

So far, there is no evidence that ISIS was involved beyond the group's own assurance that Paddock was "a soldier of the Caliphate." The group later doubled down on its claim, saying Paddock converted to Islam months ago.

Historically, ISIS has not been arbitrary in the attacks it claims have been carried out by its supporters. Experts who track the group closely say that when it comes to attacks in the West, if ISIS is claiming responsibility, there typically was some kind of connection between the perpetrator and the group.

The group does often claim responsibility for attacks that may have been merely inspired by the group's ideology -- not directed or funded by ISIS leadership. In either case, the group will credit "a soldier of the Caliphate."

"We've been clear that now is not the time to talk," White House press secretary Sarah Huckabee Sanders said during the daily White House press briefing.

She said the only conversations the administration has had with Pyongyang are those that have been focused on returning Americans detained in that country such as Otto Warbier, the 22-year-old student who died in June shortly after his return from a 17-month imprisonment in North Korea.

"Those were the type of conversations that this administration was willing to have. Beyond that there will be no conversations with North Korea at this time," Sanders said.

US TROOP KILLED IN IRAQ: A service member was killed and another injured Sunday in Iraq after an improvised explosive struck their vehicle, according to the U.S. military-led coalition against the Islamic State in Iraq and Syria.

The Defense Department has not released the nationality or names of the service members, "pending notification of next of kin," Combined Joint Task Force Operation Inherent Resolve said in a statement.

Mattis and Dunford testify on the Afghanistan strategy before the House Armed Services Committee at 1 p.m. at the Rayburn House Office Building, room 2118. http://bit.ly/2wuoPcp

The Senate Foreign Relations Committee will consider the nomination of Kenneth Juster to be the U.S. ambassador to India 10 a.m. at Dirksen 419. http://bit.ly/2xLX8Px

A House Armed Services subcommittee will hear from the former ambassador to Iraq and other Middle East experts on securing peace after the fall of the Islamic State at 2 p.m. Tuesday at the Rayburn 2212. http://bit.ly/2xRGYkI

A House Foreign Affairs panel will hear from outside experts on Iraq and Syria genocide emergency relief and accountability at 2 p.m. at Rayburn 2172. http://bit.ly/2xHw6Ho